Running ADAS

DAS assimilation and forecast runs

Select DAS experiment to run

First, we choose a DAS run to simulate. For a list of runs

$ ls ~dao_ops 

on NCCS discover. As an example, we choose the run d591_fpit (for more about GMAO products, please see https://gmao.gsfc.nasa.gov/products)

Look for ATAG in file ~dao_ops/d591_fpit/run/FVDAS_Run_Config

$ grep ATAG ~dao_ops/d591_fpit/run/FVDAS_Run_Config

setenv ATAG    GEOSadas-5_9_1_p7

This gives us the model tag.

Build model

$ cvs co -P -r GEOSadas-5_9_1_p7 -d g591p7 GEOSadas-5_9
$ cd g591p7/src
$ ./parallel_build.csh

Setup experiment (Run fvsetup)

Run fvsetup from the bin directory (g591p7/Linux/bin) with the following options (default value chosen for ones not mentioned): [For now we choose the default value for FVICS as well]

AGCM Resolution? [b72]
> C180

OGCM Resolution? [c34]
> f34

EXPID? [u000_C180]
> g591p7ops

OBSERVING SYSTEM CLASSES?
> "ncep_1bamua_bufr,ncep_1bamub_bufr,ncep_1bhrs2_bufr,ncep_1bhrs3_bufr,
   ncep_1bmsu_bufr,ncep_osbuv_bufr,ncep_prep_bufr,ncep_sptrmm_bufr,
   disc_airs_bufr,disc_amsua_bufr,ncep_mhs_bufr,ncep_1bhrs4_bufr,
   ncep_amsre_bufr,ncep_goesfv_bufr,ncep_mtiasi_bufr,ncep_gpsro_bufr,
   aura_omi_bufr,ncep_satwnd_bufr,ncep_atms_bufr,ncep_sevcsr_bufr"

A pdf of the entire fvsetup session is provided here: File:Fvsetup session.pdf.

FVHOME

FVHOME is the home directory for fvDAS experiment. Resource files, restarts and system output will be stored under this directory. Usually it contains subdiretories:

ana/        first guess/analysis output
anasa/      job script to run stand-alone analysis
daotovs/    daotovs field output
diag/       diagnostic field output
etc/        listings and other odds & ends
fcst/       forecast run directory
fvInput/    process required inputs
obs/        post-analysis ODS files
prog/       prognostic field output
recycle/    latest restart files
rs/         restart files
run/        resource files

$FVHOME/.FVROOT gives the location of the installation bin directory.

Some of these directories are stored in the archive. After running one cycle look in $ARCHIVE/g591p7ops (where g591p7ops is the experiment ID).

Run directory

$ cd $FVHOME/run

To simulate the OPS run d591_fpit, we make a few changes:

1. NX, NY in AGCM.rc.tmpl and AGCM.BOOTSTRAP.rc.tmpl have the same values (8, 48) as in the OPS run
2. Copy HISTORY.rc.tmpl over from the OPS run
3. Copy obsys.rc over from the OPT run
4. NX, NY in GSI_GridComp.rc.tmpl should match those from the OPS run (6, 36)
5. Set NUM_SGMT to 1 in CAP.rc.tmpl
6. g5das.j
   1. PBS -l select=32
   2. setenv NCPUS 384
   3. setenv NCPUS_GSI 216

One cycle

To run one segment each of GSIsa.x and GEOSgcm.x add 'exit' before 'PART IV - Next PBS Job Segment' in g5das.j.

Data Assimilation experiment

$ cd $FVHOME/run
$ qsub g5das.j

g5das creates a scratch directory $NOBACKUP/fvwork.xxxx and runs the experiment there. After the initial setup, GSIsa.x is run with output written to ana.log followed by GEOSgcm.x which writes its output to stdout and fvpsas.log.